Electronic article surveillance markers for recorded media
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United States of America Patent
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-
Feb 17, 2004
Grant Date -
May 15, 2003
app pub date -
Nov 15, 2001
filing date -
Nov 15, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A harmonic responsive electronic article surveillance marker is associated with a central, non-recorded region and/or a peripheral non-recorded region of an optically recorded or recordable media. The marker comprising at least one elongated strip, optionally having an arcuate configuration, and composed of soft magnetic material adapted to generate a harmonic signal voltage in the presence of an applied magnetic field which provides the marker with signal identity. Advantageously, the marker is inexpensive to construct. It is readily attached to or embedded in the non-recorded region and/or the peripheral non-recorded region, and generates a high amplitude, harmonic signal voltage having significantly increased detection sensitivity. With these attributes, the marker is especially suited for electronic surveillance of recorded media such as compact disks, digital video disks, laser disks and the like.
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